No mention of how it handles obstacles; sticks, rocks, holes, small animals, etc. I mowed lawns for several years as a teenager using riding mowers similar to this. I can't count the number of times I had to stop, get off, move a stick so it doesn't jam the blades, move a rock so it doesn't get flung into a nearby window...or even just slow down because the grass was too thick for the mower to handle. It strikes me as having some of the same issues my robot vacuum has. When I have to constantly get it unstuck from a lamp cord or a loose rug, it starts to become more trouble than it's worth.